found: Hrvatski skladatelj, 2005:title page (... Josipu Haidenu) page 136 (Hayden; name so written on the register of the composer's marriage at St. Stephen's, Vienna; also the form used by the composer to sign a quitaance for salary at Eisentadt in 1762) 137 (Heyden: the composer's name is so written throught the "Convention und Verhaltungsnorma under which he held his appointment at Eisenstadt)